My 5th book "50 Tips on JavaScript" is on sale. Go get it from https://50tips.dev.
Illustrated guide to 50 of the most interesting JavaScript topics.

dalekjs

DalekJS - Automated cross browser testing with JavaScript!

If you like instruments like Selenium or Phantomjs you should definitely check DalekJS. Written by Sebastian Golasch this nodejs module could help you to test your front-end.